/**
 *    Copyright (C) 2008, 2009  Victor Smirnov <aist11@gmail.com>
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 3 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License along
 *    with this program; if not, write to the Free Software Foundation, Inc.,
 *    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 *    See LICENSE.exceptions in the root folder of this project for possible
 *    exceptions
 *
 */

#ifndef _CUBEFS_CORE_BTREE_PAGES_DISPATCHERS_DEFS_HPP
#define	_CUBEFS_CORE_BTREE_PAGES_DISPATCHERS_DEFS_HPP

#include <cubefs/api/types.hpp>

#include <cubefs/core/tools/types/typelist.hpp>
#include <cubefs/core/tools/types/relation.hpp>


namespace cubefs    {
namespace btree     {


using namespace cubefs::tools;
using cubefs::TypeList;

const BigInt ANY_LEVEL = 0x7fff;

typedef enum {ROOT, LEAF, LEVEL} NodeDescriptorColumns;

template <bool Root_, bool Leaf_, BigInt Level_>
struct NodeDescriptor {
    static const bool   Root  =      Root_;
    static const bool   Leaf  =      Leaf_;
    static const BigInt Level =      Level_;
};

template <Int Name, typename ColumnType, typename Record> struct ValueProvider;

typedef RelationMetadata<
            TypeListTool<Column<ROOT, bool>, Column<LEAF, bool>, Column<LEVEL, Short> >::List,
            ValueProvider
>                                                                               NodeDescriptorMetadata;


template <typename ColumnType, typename Record>
struct ValueProvider<ROOT, ColumnType, Record>:
    public StaticValue<ColumnType, Record::Descriptor::Root> {};

template <typename ColumnType, typename Record>
struct ValueProvider<LEAF, ColumnType, Record>:
    public StaticValue<ColumnType, Record::Descriptor::Leaf> {};

template <typename ColumnType, typename Record>
struct ValueProvider<LEVEL, ColumnType, Record>:
    public StaticValue<ColumnType, Record::Descriptor::Level> {};


}
}

#endif //_CUBEFS_CORE_BTREE_PAGES_DISPATCHERS_DEFS_HPP